Gahnite and Petalite Physical Properties

Gahnite

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.00-4.622.40

1 7.18

1.5 Fracture

Conchoidal, Uneven

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

Indistinct parting on [111]

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

7.5-86-6.5

2 10

1.8 Chemical Composition

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Gahnite and Petalite Chemical Formula

While comparing Gahnite and Petalite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Gahnite and Petalite chemical formula.

Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Blue Gemstones

Gahnite Vs Indicolite Blue Tourmaline

Gahnite Vs Howlite

Gahnite Vs Hydrogrossular

Gahnite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 2.40 whereas that of Petalite is 2.40.